US8201740B2 - Imaging reader for and method of improving visibility of aiming pattern - Google Patents
Imaging reader for and method of improving visibility of aiming pattern Download PDFInfo
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- US8201740B2 US8201740B2 US11/906,090 US90609007A US8201740B2 US 8201740 B2 US8201740 B2 US 8201740B2 US 90609007 A US90609007 A US 90609007A US 8201740 B2 US8201740 B2 US 8201740B2
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- pattern
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- 238000003384 imaging method Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 14
- 230000003287 optical effect Effects 0.000 claims description 37
- 238000005286 illumination Methods 0.000 claims description 18
- 238000007493 shaping process Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 14
- 230000000295 complement effect Effects 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 2
- 229910052710 silicon Inorganic materials 0.000 claims 2
- 239000010703 silicon Substances 0.000 claims 2
- 230000004397 blinking Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RLLPVAHGXHCWKJ-IEBWSBKVSA-N (3-phenoxyphenyl)methyl (1s,3s)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate Chemical compound CC1(C)[C@H](C=C(Cl)Cl)[C@@H]1C(=O)OCC1=CC=CC(OC=2C=CC=CC=2)=C1 RLLPVAHGXHCWKJ-IEBWSBKVSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 210000005224 forefinger Anatomy 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K2207/00—Other aspects
- G06K2207/1011—Aiming
Definitions
- Solid-state imaging readers have been used in supermarkets, warehouse clubs, department stores, and other kinds of retailers to electro-optically read one-dimensional bar code symbols, particularly of the Universal Product Code (UPC) type, on products to be purchased, each symbol having a row of bars and spaces spaced apart along one direction, and also for processing two-dimensional symbols, such as Code 49, on such products, as well as other items.
- UPC Universal Product Code
- Code 49 which introduced the concept of vertically stacking a plurality of rows of bar and space patterns in a single symbol, is described in U.S. Pat. No. 4,794,239.
- PDF417 Another two-dimensional code structure for increasing the amount of data that can be represented or stored on a given amount of surface area is known as PDF417 and is described in U.S. Pat. No. 5,304,786.
- a typical imaging reader has a one- or two-dimensional array of cells or photosensors, which correspond to image elements or pixels in a field of view of the array, and is similar to that used in a digital camera.
- the array may be a one- or two-dimensional charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device, together with associated circuits for producing electronic signals corresponding to a one- or two-dimensional array of pixel information over the field of view.
- CMOS complementary metal oxide semiconductor
- a microprocessor is used to analyze and decode the captured image of the symbol.
- the array may be used for capturing a monochrome image of a symbol as, for example, disclosed in U.S. Pat. No. 5,703,349.
- the array may have multiple buried channels for capturing a full color image of a target as, for example, disclosed in U.S. Pat. No. 4,613,895. It is common to provide a two-dimensional CCD with a 640 ⁇ 480 resolution commonly found in VGA monitors, although other resolution sizes are possible.
- the symbol may be oriented in a “picket fence” orientation, in which the elongated parallel bars of the one-dimensional UPC symbol are vertical, or in a “ladder” orientation, in which the symbol bars are horizontal, or at any orientation angle in between.
- an aiming light arrangement is typically mounted in the reader, for projecting a visible aiming light pattern to visually target the symbol and, thus, advise the operator which way the reader is to be moved in order to position the aiming light pattern on the symbol, typically at the center thereof, prior to reading.
- aiming light arrangements they have proven to be less than satisfactory in certain situations. For example, in a brightly lit environment illuminated by indoor lighting of high intensity, or by outdoor lighting such as sunlight, it is often difficult for the operator to see the aiming pattern, because the aiming pattern is “drowned” out by the bright ambient light.
- lasers are sometimes used as the sources for the aiming lights.
- a laser beam of high output power is desirable for an increased ambient light immunity and greater aiming pattern visibility.
- a Class II laser is limited to a maximum laser output power of 1 milliwatt if there is no laser shut-off feature. If there is a laser shut-off feature, then a higher power in the emitted laser beam is permitted.
- the reader is preferably embodied as a portable, point-of-transaction, gun-shaped, hand-held housing, but could be embodied as a hand-held, box-shaped housing, or the like.
- the reader Prior to reading of the symbols, the reader is brought to, and aimed at, the symbols by an operator.
- the reader is installed in a retail establishment, such as a supermarket, but can be installed virtually anywhere requiring symbols to be read.
- a one- or two-dimensional, solid-state imager under control of a controller is mounted in the reader, and includes an array of image sensors operative for capturing light from a one-dimensional and/or a two-dimensional symbol over a field of view, and for generating an electrical signal indicative of the captured light.
- the field of view of the imager diverges in an outward direction away from the imager.
- the array is a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) array.
- An imaging lens is preferably mounted in the reader in front of the imager to focus the captured light onto the imager. The imaging lens causes the field of view to rapidly widen at a steeper angle of divergence.
- the imager may be associated with a high-speed strobe illuminator under control of the controller to enable the image of the symbol to be acquired in a very short period of time, for example, on the order of 500 microseconds, so that the symbol image is not blurred even if there is relative motion between the imager and the symbol.
- the strobe illumination is preferably brighter than ambient illumination.
- the illumination can also be continuous.
- the imager captures light over an exposure time period, also under the control of the controller. A short exposure time also prevents image blurring.
- the controller is also operative for processing the electrical signal into data indicative of the symbol being read.
- an aiming light assembly is supported by the housing, and is operative for projecting an aiming light pattern on the symbol.
- the aiming light assembly is also operatively connected to the controller, for modulating the aiming light pattern to render the aiming light pattern more visibly discernible to the operator to enable the operator to position the aiming light pattern on the symbol prior to reading.
- the aiming light pattern is turned off during reading.
- a modulated or flashing light pattern is more discernible to the human eye than a continuous or constant light pattern.
- the controller modulates the aiming light pattern at a blink frequency in a range of from one to four Hertz.
- the controller is operative for determining an ambient light condition above a threshold light intensity, and for modulating the aiming light pattern only when the ambient light condition determined by the controller is above the threshold light intensity.
- the threshold light intensity is the level of ambient light below which the aiming light pattern becomes difficult to visually discern.
- the aiming light pattern is preferably not modulated under low ambient light where there is less of a necessity to make the aiming light pattern more noticeable.
- the aiming light pattern can be modulated at a high blink frequency, e.g., above 25 Hertz, and at a low duty cycle, such that the operator will not notice any change in the intensity of the aiming light pattern due to the integration of the human eye. This is especially useful for some operators who may find the modulated aiming light pattern objectionable.
- One way to determine a brightly lit environment is to have the controller determine a gain of the imager over a time period.
- the aiming light assembly preferably includes one or a plurality of light sources and one or a plurality of pattern shaping optical elements, such as diffractive or refractive optical elements.
- One or each light source is advantageously a laser.
- the controller pulses one or each laser in a blinking mode at a duty cycle, for example, on the order of 50 percent. This allows the output power of one or each laser to be increased for each pulse, thereby increasing the brightness of the aiming light pattern, but the average output power is kept below safety restriction levels due to the duty cycle. In addition, the working lifetime of each laser is increased due to the duty cycle.
- the method of electro-optically reading symbols advantageously comprises the steps of moving a housing by an operator; capturing light over a field of view from a symbol, and generating an electrical signal indicative of the captured light; processing the electrical signal into data indicative of the symbol being read; and projecting an aiming light pattern on the symbol, and modulating the aiming light pattern to render the aiming light pattern more visibly discernible to the operator to enable the operator to position the aiming light pattern on the symbol prior to reading.
- FIG. 1 is a perspective view of an imaging reader for electro-optically reading symbols by image capture in accordance with this invention
- FIG. 2 is a diagrammatic plan view of components within the reader of FIG. 1 including components of an aiming light arrangement
- FIG. 3 is a front view of a two-dimensional symbol illuminated by the aiming light arrangement of FIG. 2 prior to reading.
- Reference numeral 10 in FIG. 1 generally identifies a hand-held imaging reader for electro-optically reading symbols or like indicia on products or like targets.
- the reader 10 includes a housing 12 in which an aiming light assembly, as described in detail below in accordance with this invention, is incorporated.
- the housing 12 includes a generally elongated handle or lower handgrip portion 14 and a barrel or upper body portion 16 having a front end at which a light-transmissive window 18 is located.
- the cross-sectional dimensions and overall size of the handle are such that the reader can conveniently be held in an operator's hand.
- the body and handle portions may be constructed of a lightweight, resilient, shock-resistant, self-supporting material such as a synthetic plastic material.
- the plastic housing may be injection molded, but can be vacuum-formed or blow-molded to form a thin hollow shell which bounds an interior space whose volume is sufficient to contain the various components of this invention.
- a manually actuatable trigger 20 is mounted in a moving relationship on the handle 14 in a forward facing region of the reader.
- the operator's forefinger is used to actuate the reader to initiate reading by depressing the trigger.
- An optional flexible electrical cable 22 is provided to connect the reader to a remote host 24 .
- the cable may also provide electrical power to the reader.
- the host 24 has access to a database for retrieval of information. If the cable 22 is not used, then a wireless link to transfer data may be provided between the reader 10 and the host 24 , and an on-board battery, typically within the handle, can be used to supply electrical power.
- An alternative embodiment incorporates a display and a keyboard. Data obtained from reading the symbols is then either transferred to the remote host 24 in real time, or saved to an internal memory such that the stored data can be transferred to the host 24 at a later time in batch mode.
- a solid-state imager 30 is mounted within the housing 12 and preferably is a one- or two-dimensional, charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS) array of cells or sensors operative for capturing light over its field of view from a symbol through the window 18 and focused by an imaging lens assembly 32 .
- the sensors produce electrical signals corresponding to a one- and/or two-dimensional array of pixel information for an image of the symbol.
- the electrical signals are processed by a controller or microprocessor 26 into data indicative of the symbol being read.
- the imager 30 and imaging lens assembly 32 are preferably aligned along a centerline or an optical axis 34 generally centrally located within the body portion 16 . As shown in FIG.
- the imaging lens assembly 32 has a fixed focus and enables image capture over a range of working distances between a close-in distance WD 1 and a far-out distance WD 2 relative to the window 18 .
- the imager and imaging lens assembly are capable of acquiring a full image of the symbol in lighting conditions from two lux to direct sunlight. Exposure time is about 15 milliseconds and controlled by the controller 26 . Resolution of the array can be of various sizes although a VGA resolution of 640 ⁇ 480 pixels is preferred.
- An illumination or light source 36 for the imager 30 is also provided to provide an illumination field for the imager.
- the source 36 preferably constitutes one or a plurality of light emitting diodes energized by power supply lines in the cable 22 , or via the on-board battery.
- the source 36 is preferably pulsed in synchronism with the imager 30 under the control of the controller 26 .
- an aiming light assembly is supported by the housing 12 , and is operative for projecting an aiming light pattern, such as light markers 102 , 104 , and 106 , as depicted in FIG. 3 , on a symbol, such as a two-dimensional symbol 100 printed on a sheet medium, such as the back of a driver's license 108 .
- Markers 104 and 106 are advantageously formed as inwardly facing arrowheads to bracket opposite ends of the symbol.
- Marker 102 is advantageously formed as a generally circular spot for placement at the center of the symbol.
- Other aiming light patterns for framing the symbol are contemplated. The pattern may consist solely of the spot 102 or crosshairs.
- the aiming light assembly includes one or a plurality of light projectors for projecting the markers 102 , 104 , and 106 onto the symbol 100 .
- One or each projector includes a light source, such as a laser 68 , 70 , a focusing lens 72 , 74 , and a pattern shaping optical element, such as a diffractive optical element (DOE) 76 , 78 , or a refractive optical element (ROE).
- DOE diffractive optical element
- ROE refractive optical element
- Diffractive/refractive optics creates a bright, crisp aiming light pattern which provides ready feedback to the operator regarding the direction in which the housing 12 and, hence, the field of view is to be moved in order to position the symbol entirely within the field of view, as described below.
- each laser light source has an output power on the order of 5 milliwatts and a wavelength of 650 nanometers.
- diffractive/refractive optics it is also possible to use masks to project the aiming light pattern onto the symbol.
- the aiming light assembly is also operatively connected to the controller 26 , for modulating the aiming light pattern to render the aiming light pattern more visibly discernible and noticeable to the operator to enable the operator to position the aiming light pattern on the symbol prior to reading.
- the aiming light pattern is turned off during reading.
- a modulated or flashing light pattern is more discernible to the human eye than a continuous or constant light pattern.
- the controller 26 modulates the aiming light pattern at a blink frequency in a range of from one to four Hertz, although other frequencies could be employed.
- a set of different frequencies may indicate different modes of operation, e.g., fast blinking mode or slow blinking mode, to the operator for additional means of communication between the operator and the reader.
- the controller 26 is operative for determining an ambient light condition above a threshold light intensity, and for modulating the aiming light pattern only when the ambient light condition determined by the controller 26 is above the threshold light intensity.
- the aiming light pattern is preferably not modulated under low ambient light where there is less of a necessity to make the aiming light pattern more noticeable. This is especially useful for some operators who may find the modulated aiming light pattern objectionable.
- the aiming light pattern can be modulated at a high blink frequency, e.g., above 25 Hertz, and at a low duty cycle, such that the operator will not notice any change in the intensity of the aiming light pattern due to the integration of the human eye.
- One way to determine a brightly lit environment is to have the controller 26 determine a gain of the imager over a time period. Another way is to employ a separate photodetector for sensing the ambient light level, and to have the controller modulate the aiming light pattern either only when the photodetector senses the ambient light to be above a predetermined threshold level, or to have the controller modulate the aiming light pattern relatively slowly when the photodetector senses the ambient light to be above a predetermined threshold level and relatively rapidly when the photodetector senses the ambient light to be below the predetermined threshold level.
- the controller pulses one or each laser at a duty cycle, for example, on the order of 50 percent. This allows the output power of one or each laser to be increased for each pulse, thereby increasing the brightness of the aiming light pattern, but the average output power is kept below safety restriction levels due to the duty cycle. For example, if the duty cycle is fifty percent, then the output laser power within each pulse can be doubled, thereby increasing the visibility of the aiming light pattern by a factor of two.
- the operator points the reader 10 at the symbol 100 to be read and manually depresses the trigger 20 to initiate reading.
- the controller 26 activates the imager 30 and initially determines whether the ambient light level is low or high. If the ambient light level is high, then the controller 26 pulses the aiming lasers 68 , 70 to project the modulated aiming light pattern with an increased visibility on the symbol to visually prompt the operator to shift the housing 16 and, hence, the field of view until the symbol is entirely within the shifted field of view. Once the symbol is entirely within the field of view, the controller 26 activates the illumination source 36 , and the illuminated symbol can be successfully decoded by the controller 26 , and an indicator will so advise the operator.
- each aiming laser 68 , 70 is deactivated during the reading of the symbol. If the ambient light level is low, then the controller 26 can either not pulse the lasers 68 , 70 , because the aiming light pattern, when unmodulated, can be more readily seen by the operator in the dimly lit environment, or the controller 26 can more rapidly pulse the lasers 68 , 70 to create an aiming light pattern that appears not to be varying in intensity due to human eye integration.
Abstract
Description
Claims (23)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/906,090 US8201740B2 (en) | 2007-09-28 | 2007-09-28 | Imaging reader for and method of improving visibility of aiming pattern |
PCT/US2008/076999 WO2009045755A1 (en) | 2007-09-28 | 2008-09-19 | Imaging reader for and method of improving visibility of aiming pattern |
Applications Claiming Priority (1)
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US11/906,090 US8201740B2 (en) | 2007-09-28 | 2007-09-28 | Imaging reader for and method of improving visibility of aiming pattern |
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US20090084851A1 US20090084851A1 (en) | 2009-04-02 |
US8201740B2 true US8201740B2 (en) | 2012-06-19 |
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US11/906,090 Active 2029-05-02 US8201740B2 (en) | 2007-09-28 | 2007-09-28 | Imaging reader for and method of improving visibility of aiming pattern |
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Cited By (5)
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US20150294128A1 (en) * | 2012-12-27 | 2015-10-15 | Optoelectronics Co., Ltd. | Optical information reading device |
US11227173B2 (en) | 2020-02-18 | 2022-01-18 | Datalogic IP Tech, S.r.l. | Virtual-frame preprocessing for optical scanning |
US11893450B2 (en) | 2021-12-06 | 2024-02-06 | Datalogic IP Tech, S.r.l. | Robust optical aimer for triangulation-based distance measurement |
WO2024050124A1 (en) | 2022-09-02 | 2024-03-07 | Dexcom, Inc. | Devices and methods for measuring a concentration of a target analyte in a biological fluid in vivo |
US11928546B2 (en) | 2020-12-30 | 2024-03-12 | Datalogic IP Tech, S.r.l. | Dual illuminator as field of view identification and aiming |
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US8899484B2 (en) * | 2008-09-26 | 2014-12-02 | Symbol Technologies, Inc. | Imaging reader and method with enhanced aiming pattern detection |
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US9680282B2 (en) * | 2015-11-17 | 2017-06-13 | Hand Held Products, Inc. | Laser aiming for mobile devices |
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Cited By (7)
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US20150294128A1 (en) * | 2012-12-27 | 2015-10-15 | Optoelectronics Co., Ltd. | Optical information reading device |
US9633245B2 (en) * | 2012-12-27 | 2017-04-25 | Optoelectronics Co., Ltd. | Optical information reading device |
US11227173B2 (en) | 2020-02-18 | 2022-01-18 | Datalogic IP Tech, S.r.l. | Virtual-frame preprocessing for optical scanning |
US11675986B2 (en) | 2020-02-18 | 2023-06-13 | Datalogic IP Tech, S.r.l. | Virtual-frame preprocessing for optical scanning |
US11928546B2 (en) | 2020-12-30 | 2024-03-12 | Datalogic IP Tech, S.r.l. | Dual illuminator as field of view identification and aiming |
US11893450B2 (en) | 2021-12-06 | 2024-02-06 | Datalogic IP Tech, S.r.l. | Robust optical aimer for triangulation-based distance measurement |
WO2024050124A1 (en) | 2022-09-02 | 2024-03-07 | Dexcom, Inc. | Devices and methods for measuring a concentration of a target analyte in a biological fluid in vivo |
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US20090084851A1 (en) | 2009-04-02 |
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